596878501 Trimmer Head Spindle Assembly with 532180333 594935103 Compatible with Husqvarna Poulan Craftsman HU625WT HU625WTX HU625HWT PR22WT WT420 J625HWT String Trimmers

What It Is

This trimmer head spindle assembly replaces the rotating hub and shaft that drives the cutting head on Husqvarna, Poulan, and Craftsman string trimmers. It’s designed for walk-behind models with 625 series engines (like HU625WT, HU625WTX, HU625HWT, PR22WT, WT420, J625HWT) that use a blade or trimmer head mounted directly to the spindle.

Fitment & Compatibility

• Check your model number – Compatible with Husqvarna HU625WT, HU625WTX, HU625HWT, Poulan PR22WT, WT420, and Craftsman J625HWT. Not for other engine series or older 500/600 models without the “625” suffix.
• Measure the spindle shaft – OEM specs: 0.75” diameter, 2.5” length, with a 5/16-24 threaded tip. Confirm your old spindle matches these dimensions.
• Deck size doesn’t matter – This part fits any deck width on these models (22” or 25”), as long as the engine and mounting pattern match.
• Includes OEM equivalents – Replaces Husqvarna 596878501, 532180333, and 594935103. Aftermarket unit, not genuine OEM, but meets OEM specs.
• Check your mounting bolts – Uses two 5/16” bolts (not included). Verify bolt spacing matches the old spindle’s flange holes (about 2.5” center-to-center).

Key Things to Know

• Quality concern – Some users report the bearing is less smooth than OEM; expect slightly more vibration. Fine for occasional use, but commercial operators may prefer genuine Husqvarna.
• Installation difficulty – Moderate. You’ll need a socket set, thread locker, and a puller to remove the old spindle from the engine shaft. Not a 5-minute swap.
• Common gotcha – The threaded tip is right-hand thread. Tighten the trimmer head clockwise. Reverse thread on some older models – double-check before reassembly.
• Includes bearing – Pre-assembled with a sealed ball bearing; no need to press out old one. Just bolt on and go.

Should You Buy It

Buy this if you own a 625-series walk-behind trimmer and want a budget-friendly replacement for a worn or bent spindle. It’s a solid value for DIY homeowners, but if you run a landscaping business or need zero vibration, stick with the OEM part.